, a new spider riffle beetle species from Borneo, redescription of Jäch including a description of the larva and new distribution data for Jäch using DNA barcodes (Coleoptera, Elmidae).

(Coleoptera, Elmidae) a new spider riffle beetle discovered from northern Borneo (Brunei; Sabah and Sarawak, Malaysia) and the larva of Jäch are described. Illustrations of the habitus and diagnostic characters of the new species and the similar and highly variable are presented. Differences to closely related species, based on DNA barcodes and morphological characters, are discussed. Association of the larva and the imago of , and the occurrence of Jäch in Peninsular Malaysia and Sabah are confirmed by using COI mtDNA sequences.